/* ============================================================
   CIP SENTINEL — Design Tokens & Component Styles
   Critical Infrastructure Protection Intelligence Hub
   ============================================================ */

/* --- Type Scale (Fluid) --- */
:root {
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);

  /* Spacing (4px base) */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;

  /* Font families */
  --font-display: 'General Sans', 'Inter', sans-serif;
  --font-body: 'Satoshi', 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
}

/* --- DARK THEME (default for this site) --- */
:root, [data-theme="dark"] {
  --color-bg:               #0c1017;
  --color-surface:          #111820;
  --color-surface-2:        #161e28;
  --color-surface-offset:   #1a2332;
  --color-surface-offset-2: #1f2a3a;
  --color-surface-dynamic:  #253344;
  --color-divider:          #263040;
  --color-border:           #2d3a4d;

  --color-text:             #d4dbe6;
  --color-text-muted:       #7a8a9e;
  --color-text-faint:       #4a5a70;
  --color-text-inverse:     #0c1017;

  /* Primary — Teal/Cyan for CIP compliance */
  --color-primary:          #3db8c4;
  --color-primary-hover:    #2da0ab;
  --color-primary-active:   #1e8892;
  --color-primary-highlight: #1a3a40;

  /* Alert — Amber/Orange for vulnerabilities */
  --color-alert:            #e8943a;
  --color-alert-hover:      #d07c28;
  --color-alert-active:     #b86818;
  --color-alert-highlight:  #3a2e1a;

  /* Critical — Red for critical severity */
  --color-critical:         #e05252;
  --color-critical-hover:   #c93e3e;
  --color-critical-highlight: #3a1a1a;

  /* Success — Green */
  --color-success:          #52b87a;
  --color-success-highlight: #1a3a28;

  /* Shadows */
  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.25);
  --shadow-md: 0 4px 12px oklch(0 0 0 / 0.35);
  --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.45);
}

/* --- LIGHT THEME --- */
[data-theme="light"] {
  --color-bg:               #f0f2f5;
  --color-surface:          #ffffff;
  --color-surface-2:        #f7f8fa;
  --color-surface-offset:   #ebeef2;
  --color-surface-offset-2: #e2e6ec;
  --color-surface-dynamic:  #d8dce4;
  --color-divider:          #d0d5de;
  --color-border:           #c4cad6;

  --color-text:             #1a2030;
  --color-text-muted:       #5a6578;
  --color-text-faint:       #8e97a8;
  --color-text-inverse:     #f0f2f5;

  --color-primary:          #0e7a84;
  --color-primary-hover:    #096068;
  --color-primary-active:   #064a52;
  --color-primary-highlight: #d4eff2;

  --color-alert:            #c47020;
  --color-alert-hover:      #a85d14;
  --color-alert-active:     #8c4c08;
  --color-alert-highlight:  #fef3e2;

  --color-critical:         #c43030;
  --color-critical-hover:   #a52424;
  --color-critical-highlight: #fde8e8;

  --color-success:          #2d8a52;
  --color-success-highlight: #e2f5ea;

  --shadow-sm: 0 1px 2px oklch(0.2 0.01 240 / 0.06);
  --shadow-md: 0 4px 12px oklch(0.2 0.01 240 / 0.08);
  --shadow-lg: 0 12px 32px oklch(0.2 0.01 240 / 0.12);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    --color-bg:               #f0f2f5;
    --color-surface:          #ffffff;
    --color-surface-2:        #f7f8fa;
    --color-surface-offset:   #ebeef2;
    --color-surface-offset-2: #e2e6ec;
    --color-surface-dynamic:  #d8dce4;
    --color-divider:          #d0d5de;
    --color-border:           #c4cad6;
    --color-text:             #1a2030;
    --color-text-muted:       #5a6578;
    --color-text-faint:       #8e97a8;
    --color-text-inverse:     #f0f2f5;
    --color-primary:          #0e7a84;
    --color-primary-hover:    #096068;
    --color-primary-active:   #064a52;
    --color-primary-highlight: #d4eff2;
    --color-alert:            #c47020;
    --color-alert-hover:      #a85d14;
    --color-alert-active:     #8c4c08;
    --color-alert-highlight:  #fef3e2;
    --color-critical:         #c43030;
    --color-critical-hover:   #a52424;
    --color-critical-highlight: #fde8e8;
    --color-success:          #2d8a52;
    --color-success-highlight: #e2f5ea;
    --shadow-sm: 0 1px 2px oklch(0.2 0.01 240 / 0.06);
    --shadow-md: 0 4px 12px oklch(0.2 0.01 240 / 0.08);
    --shadow-lg: 0 12px 32px oklch(0.2 0.01 240 / 0.12);
  }
}

/* ============================================================
   LAYOUT
   ============================================================ */

.container {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.container--narrow {
  max-width: var(--content-default);
}

/* ============================================================
   HEADER / NAV
   ============================================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: oklch(from var(--color-bg) l c h / 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-divider);
  transition: box-shadow 0.3s var(--ease-out);
}

.site-header--scrolled {
  box-shadow: var(--shadow-md);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  max-width: var(--content-wide);
  margin-inline: auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-text);
}

.logo-icon {
  width: 32px;
  height: 32px;
  color: var(--color-primary);
}

.logo-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  letter-spacing: -0.02em;
}

.logo-text span {
  color: var(--color-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
}

.nav-links a {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: color var(--transition-interactive),
              background var(--transition-interactive);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-text);
  background: var(--color-surface-offset);
}

.nav-links a.active {
  color: var(--color-primary);
}

.theme-toggle {
  padding: var(--space-2);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  transition: color var(--transition-interactive),
              background var(--transition-interactive);
}

.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-surface-offset);
}

.mobile-menu-btn {
  display: none;
  padding: var(--space-2);
  color: var(--color-text-muted);
}

/* ============================================================
   HERO
   ============================================================ */

.hero {
  padding: clamp(var(--space-12), 8vw, var(--space-24)) var(--space-4);
  text-align: left;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse 60% 50% at 20% 50%, oklch(from var(--color-primary) l c h / 0.06), transparent),
              radial-gradient(ellipse 40% 40% at 80% 30%, oklch(from var(--color-alert) l c h / 0.04), transparent);
  pointer-events: none;
}

.hero-inner {
  max-width: var(--content-wide);
  margin-inline: auto;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-primary);
  background: var(--color-primary-highlight);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  border: 1px solid oklch(from var(--color-primary) l c h / 0.2);
  margin-bottom: var(--space-6);
}

.hero-badge .pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero h1 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  max-width: 18ch;
}

.hero p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 52ch;
  margin-bottom: var(--space-8);
  line-height: 1.7;
}

.hero-stats {
  display: flex;
  gap: var(--space-8);
  flex-wrap: wrap;
}

.hero-stat {
  display: flex;
  flex-direction: column;
}

.hero-stat-value {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
}

.hero-stat-value.alert {
  color: var(--color-alert);
}

.hero-stat-value.critical {
  color: var(--color-critical);
}

.hero-stat-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: var(--space-1);
}

/* ============================================================
   SECTIONS
   ============================================================ */

.section {
  padding: clamp(var(--space-8), 6vw, var(--space-20)) var(--space-4);
}

.section-header {
  margin-bottom: var(--space-8);
}

.section-header h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.section-header p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
}

.section-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

/* ============================================================
   TABS (Page Navigation)
   ============================================================ */

.page-tabs {
  display: flex;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-4);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-divider);
  overflow-x: auto;
  max-width: var(--content-wide);
  margin-inline: auto;
}

.page-tab {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  white-space: nowrap;
  transition: color var(--transition-interactive),
              background var(--transition-interactive);
  cursor: pointer;
  border: none;
  background: none;
}

.page-tab:hover {
  color: var(--color-text);
  background: var(--color-surface-offset);
}

.page-tab.active {
  color: var(--color-primary);
  background: var(--color-primary-highlight);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* ============================================================
   NEWS CARDS
   ============================================================ */

.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(340px, 100%), 1fr));
  gap: var(--space-4);
}

.news-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  transition: box-shadow var(--transition-interactive),
              transform var(--transition-interactive),
              border-color var(--transition-interactive);
}

.news-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: oklch(from var(--color-primary) l c h / 0.3);
}

.news-card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.news-tag {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.news-tag.cip {
  color: var(--color-primary);
  background: var(--color-primary-highlight);
}

.news-tag.ferc {
  color: var(--color-alert);
  background: var(--color-alert-highlight);
}

.news-tag.policy {
  color: #8b7ad4;
  background: oklch(from #8b7ad4 l c h / 0.12);
}

.news-tag.cyber {
  color: var(--color-critical);
  background: var(--color-critical-highlight);
}

.news-tag.ot {
  color: var(--color-success);
  background: var(--color-success-highlight);
}

.news-date {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-family: var(--font-mono);
}

.news-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.4;
}

.news-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  flex: 1;
}

.news-card-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-primary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  transition: color var(--transition-interactive);
}

.news-card-link:hover {
  color: var(--color-primary-hover);
}

.news-card-link svg {
  width: 14px;
  height: 14px;
  transition: transform var(--transition-interactive);
}

.news-card-link:hover svg {
  transform: translateX(2px);
}

/* ============================================================
   VULNERABILITY TABLE
   ============================================================ */

.vuln-table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}

.vuln-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.vuln-table thead {
  background: var(--color-surface-offset);
}

.vuln-table th {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  white-space: nowrap;
  border-bottom: 1px solid var(--color-divider);
}

.vuln-table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-divider);
  vertical-align: top;
}

.vuln-table tbody tr {
  transition: background var(--transition-interactive);
}

.vuln-table tbody tr:hover {
  background: var(--color-surface-offset);
}

.vuln-table tbody tr:last-child td {
  border-bottom: none;
}

.severity-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  text-transform: uppercase;
}

.severity-badge.critical {
  color: var(--color-critical);
  background: var(--color-critical-highlight);
}

.severity-badge.high {
  color: var(--color-alert);
  background: var(--color-alert-highlight);
}

.severity-badge.medium {
  color: #d4a520;
  background: oklch(from #d4a520 l c h / 0.12);
}

.cvss-score {
  font-family: var(--font-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.vuln-vendor {
  font-weight: 500;
  color: var(--color-text);
}

.vuln-product {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

.sector-tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 600;
  padding: 2px var(--space-1);
  border-radius: var(--radius-sm);
  background: var(--color-surface-offset);
  color: var(--color-text-muted);
  white-space: nowrap;
}

/* ============================================================
   CIP STANDARDS REFERENCE
   ============================================================ */

.standards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(280px, 100%), 1fr));
  gap: var(--space-4);
}

.standard-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: box-shadow var(--transition-interactive),
              border-color var(--transition-interactive);
}

.standard-card:hover {
  box-shadow: var(--shadow-sm);
  border-color: oklch(from var(--color-primary) l c h / 0.3);
}

.standard-id {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-primary);
  text-transform: uppercase;
  margin-bottom: var(--space-2);
}

.standard-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.standard-card p {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.6;
}

.standard-status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 600;
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
  margin-top: var(--space-3);
  text-transform: uppercase;
}

.standard-status.active {
  color: var(--color-success);
  background: var(--color-success-highlight);
}

.standard-status.upcoming {
  color: var(--color-alert);
  background: var(--color-alert-highlight);
}

.standard-status.development {
  color: var(--color-text-muted);
  background: var(--color-surface-offset);
}

/* ============================================================
   RESOURCES / LINKS
   ============================================================ */

.resource-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.resource-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--color-text);
  transition: box-shadow var(--transition-interactive),
              border-color var(--transition-interactive),
              transform var(--transition-interactive);
}

.resource-item:hover {
  box-shadow: var(--shadow-sm);
  border-color: oklch(from var(--color-primary) l c h / 0.3);
  transform: translateY(-1px);
}

.resource-icon {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
  flex-shrink: 0;
  margin-top: 2px;
}

.resource-item h3 {
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.resource-item p {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* ============================================================
   TIMELINE
   ============================================================ */

.timeline {
  position: relative;
  padding-left: var(--space-8);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-divider);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--space-6);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--space-8) + 8px);
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 2px solid var(--color-bg);
}

.timeline-item.alert::before {
  background: var(--color-alert);
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-bottom: var(--space-1);
}

.timeline-item h3 {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.timeline-item p {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ============================================================
   FOOTER
   ============================================================ */

.site-footer {
  border-top: 1px solid var(--color-divider);
  padding: var(--space-8) var(--space-4);
  text-align: center;
}

.footer-inner {
  max-width: var(--content-wide);
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}

.footer-inner p {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.footer-inner a {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-interactive);
}

.footer-inner a:hover {
  color: var(--color-primary);
}

/* ============================================================
   SCROLL ANIMATIONS
   ============================================================ */

.fade-in {
  opacity: 1;
}

@supports (animation-timeline: scroll()) {
  .fade-in {
    opacity: 0;
    animation: reveal-fade linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 100%;
  }
}

@keyframes reveal-fade {
  to { opacity: 1; }
}

/* ============================================================
   MOBILE
   ============================================================ */

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    inset: 0;
    width: 100vw;
    height: 100vh;
    height: 100dvh;
    background: var(--color-bg);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--space-8);
    z-index: 100;
    padding: var(--space-8);
    list-style: none;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    font-size: var(--text-xl);
    font-weight: 600;
    padding: var(--space-3) var(--space-6);
    color: var(--color-text);
    text-decoration: none;
  }

  .nav-links a:hover,
  .nav-links a.active {
    color: var(--color-primary);
  }

  .mobile-menu-btn {
    display: block;
  }

  .hero h1 {
    font-size: clamp(1.5rem, 1rem + 3vw, 2.5rem);
  }

  .hero-stats {
    gap: var(--space-6);
  }

  .news-grid {
    grid-template-columns: 1fr;
  }

  .standards-grid {
    grid-template-columns: 1fr;
  }

  .page-tabs {
    gap: 0;
    padding: var(--space-2);
  }

  .page-tab {
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-xs);
  }

  .vuln-table {
    font-size: var(--text-xs);
  }

  .vuln-table th,
  .vuln-table td {
    padding: var(--space-2) var(--space-3);
  }

  .section {
    padding: var(--space-8) var(--space-4);
  }
}

@media (max-width: 480px) {
  .hero-stats {
    flex-direction: column;
    gap: var(--space-4);
  }
}